Improvement in machine for grinding edge tools



/f/G W g). v l `l" I #mail l Straten tutti r @m I we. 7 www JAMES D. SMITH, OF GREIG, YORK; Letters Patent No. 87,212, latediFebrua/ry 23, 1869; antedated Febrero/ry 15,1869.

IMPROVEMENT IN MACHINE FOR G-RNDING- EDGE TOOLS.

The Schedule referred to in these Letters Patent and making part of the Seme.

To all whom it may concern:

Be it known that I, J AMES D. SMITH, of the town of Greig, inthe county of Lewis, and State of New York,

have invented certain new and'useful Improvements in Machines for Grinding Edged Tools and other iinplements; and I do hercbydeclare that the following isa full, clear, and exact description of the same, eference being had to the accompanying drawings, making part of this specification, in which- -Figure 1 represents a front elevation of my machine, showing it applied in connection with a grind- Stone.

Figure 2 is a top view ofthe same.

' Figure 3 is a vertical section across the same.

Figure 4 is a detached vertical section of the toolv stock of the same, showing the manner of securing the edged tools on the stock.

Figure 5 is a rear elevation of a portion of the same.

Figure 6 is a perspective View of the clampof the tool-stock of the same.

Similar' letters of reference indicate corresponding parts in the several iigures.

In implements for grinding the cutting-edges or other surfaces of tools, 85o., it is, in many instances, of great importance to grind such edges to great accuracy; to have them as nearly straight as they can be made; or to have them with a certain-curve; or to make a num- -ber of the same shape or curve, which is more -particuy larly the case with the edges of planing-irons or shears, or shear-plates operating against guide-plates, where ,two faces have to meet with exactness; and themore particular' object of my invention is to provide au instrument by means of which such tools or articles can readily be ground to great exactness in a very short space of time, and even when very-unskilful workmen are employed.

The nature of my invention consists in providing an instrument which may be readily attached, and used in connection with the grindstone, and to which the article to be ground is readily adjusted and secured at the proper or desired tangent or angle with the face or periphery of the stone, and which instrument `or tool-stock is arranged to slide horizontally in front of the `periphery of the "stone, and is guided while sliding, so as to keep it in the relative tangential position, by

meauseof a guide or pattern-bar connected therewith,

and is provided with an automatic feeding-device, op-

erated from the stone and its axle,- in such a manner that the said article may be ground with precision by incompetent persons, and in a short space of time.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the drawings, I have shown my device applied to 'the ordinary grindstone, of which A represents the stone; B, the grindstone-trough; C, the axle of the stone; D, the bearings; and E, the ordinary support bars, which are bolted to the trough, and are provided to the periphery of the stone.

of my device, by means of bolts G, which pass through H, made in the bed-plate F, right-angular to theslots in the support-bars, to provide for the proper adjustment of the apparatus toward the periphery and face of the stone.

tical standards, I, I, and J, which may bezcast on `the upon thebed-plate, as shown.

is for the purpose of a pattern or guide-bar, to guide the tool-stock, and the relative position of the article to be ground, toward the face ofthe stone.

L represents the tool-stock, of which the vcentral these bearings M M.

Now, upon the round part of one side, and close the central part of the--tool-stock, I secure an arm, N, by means of the set-screw n, which arm N extends upward in front of the bar K, in which is tted a secondary set-screw, o, by means of which the said end of Iiphery of the stone, is adjusted.

0 represents a flat spring, which is secured, at p, to the arm N, and bears, with its loose end, against the rear face of the bar K, so that the article to be ground is allowed to yield to inequalities, and is 'kept bearing,

the face of the stone, and being ground.

In order to obtain a regular and proper feed or slidof the stone, I provide a horizontal shaft, P, which rests, with one end, in the standard J, and is, at its other end, supported in the standard I, which shaft is providedwith a screw-thread, fr, of the proper pitch,

two fixed pulleys, Q Q, and one tween. I

I also provide a belt-shifter, S, which has upon it two stop-rings, T T, capable of being adjusted and set upon the shifter and I havea cross-piece, U, arranged vertically across the ends of the 'tool-stock, the shaft P,

loose pulley, R, be-

with the ordinary slots, t'- allow the rest to be adjusted Upon the support-bars E, I secure the bed-plate F the said slots inthe support-bars E, and through slots Now, my device for grinding consists of three ver-l bed-plate F, or may be made separate, and secured- The upper ends of the standards I I are connected i by means of a bar, K, which is bolted to the same, and

part is made dat, with a straight face, m, upon which the stone, and can be turned and will freely slide in toy the arm N can he set off, more or less, from the front l face of the bar K, whereby the desired relative position of the article gto be ground, to the face and peto a proper extent, upon the stone, while sliding along ing motion of the article to be ground across the face and upon its outer portion, near the standard -T, with and the shifter S, and fitted with a screw-thread, to work over the screwlthread, fr, upon the shaft I. Its upper end is attached to the end of the tool-stock L, and is made to, pass freely over the shifter S', and I provide, on an extension ofthe axle C of the stone, as shown, or on a counter-shaft elsewhere, a fixed pulley, V, corresponding, throughout its whole length, with the face of the pulleys Q, Q, and R, which fixed f pulley serves to transmit a rotary motion to the shaft and, after having passed oli` the said cross-piece, it acts upon the respective stop-ling CI, and moves the one,

'by means of the shifter S, over to the4 loose pulley,

and the other belt moving, in an opposite direction, upon one of the fixed pulleys, thereby drawing the tool-stock, and the article to be ground, back and forth upon the face of the stone, until the grinding of same is nished. i

The central part of the tool-stock L may be made with a slot, u, and a clamp, c, as shown in figs. 4, 5, and 6; and it may be provided with other means to secure the article to be ground readily and firmly.

To guide the article, i n placing it upon the toolstock,

to a certain desired position, I provide the said stock with guide-pins, x, on its face.

For articles, such as planing-irons, shear-plates, Ste., in which the edge to be ground is straight, I use a straight guide-bar, K, while, for curved edges, I make and use, instead, a bar which is curved according to the desired edge.

From the foregoing, it will be seen that this device for grinding is of' comparatively small expense, and the grinding can be done, with great enactness and precision, by persons incapable of doing so without the aid of the device.

Having fully described my invention,

J .Al/IES D. SMITH.

What I claim therein, and desire to secure by Let-` 

